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The development of cloud computing, fog computing, and edge computing brings a number of challenges, e.g., QoS optimization and energy saving. We do a comprehensive survey on QoS optimization and energy saving in cloud computing, fog computing, edge computing, and IoT environments. We summarize the main challenges and analyze corresponding solutions proposed by existing works. This survey aims to help readers have a deeper understanding on the concepts of different computing models and study the techniques of QoS optimization and energy saving in these models.<\/jats:p>","DOI":"10.1155\/2020\/8964165","type":"journal-article","created":{"date-parts":[[2020,3,16]],"date-time":"2020-03-16T23:32:13Z","timestamp":1584401533000},"page":"1-16","source":"Crossref","is-referenced-by-count":16,"title":["Study QoS Optimization and Energy Saving Techniques in Cloud, Fog, Edge, and IoT"],"prefix":"10.1155","volume":"2020","author":[{"given":"Zhiguo","family":"Qu","sequence":"first","affiliation":[{"name":"Engineering Research Center of Digital Forensics, Ministry of Education, Nanjing, China"},{"name":"Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, 210044 Nanjing, 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